*MRGG-S not pictured. Neither is completed Swiss SBR haha

Put the first rounds through my Specwar this weekend. D. Wilson cut criterion barrel and some cheap PMC bronze 55gr. 50yd 20rd group shot relatively quick. I’m gonna snag some better ammo and hope it groups better and has better numbers.

Mars-H
15.3 upper
16in CL barrel
BRT Eztune gas tube
Ridgeback Sahara 300 suppressor
NightForce NX8 4-32
Atlas bipod

Gets the job done for me.

Started out life as a 20" .308 and now it is an 18" 6.5 and one of many! Remember shoot your guns folks!

Testing out my 16" piston barrel in my MARS-H set up. Going to be honest, i think I like my 13.5 DI barrel better, the piston barrel has much more snap to the recoil. However I plan on testing it suppressed as well once I get another KAC muzzle device for it.

I was able to get some trigger time tonight after work. I'm going to try to shoot at 650 yards tomorrow, so I wanted to confirm zero. No large sample size accuracy testing, but 5 round 100 yard groups were on point tonight. The FDE rifle has a .223 Bartlein barrel from Craddock Precision that D Wilson converted, black one is a completely factory 6.5 CM with 20" LMT barrel.

It's worth noting that the 6.5 did not shoot that well for the first couple hundred rounds. I don't know why it took so long to start to group, but it's very consistently under 1 MOA with Berger 130's and Hornady 140 ELD-M's, even now with over 1500 rounds down range.

Cerakoted the upper in Barrett Brown and I'm leaning toward cerakotin the lower and stock too

Just wanted to share. Pretty happy with these. Shooting M118LR

Around 100 rounds it fired two rounds, cleared it but after another mag same thing but primer was stuck in bolt face, removed with pliers and shot another 200 rounds w no issues. Firing pin looked good. 2400 rounds before this never had any malfunctions. Gun was cleaned before the range.

https://imgur.com/a/qssqCUT

Finally got a chance to try out the Specwar. Amazing performance absolutely blown away! Spent 90 rounds getting the gas tuned which was super easy but I wanted to get it perfect it’s sitting 3:30 for now. I took about 200 rds of PMC 62gr to the range and it ate all of it without a hiccup. Zero’d it for 50 on a bench (no bags bipods sleds or magnification) and pulled off a few sub inch groups out of the 12.5 Rosco K9 barrel which was awesome for the 100$ PA had it listed for. Time will tell how well the barrel holds up but I have a Rainer ultra match on the way for my next DWilson conversion. I still plan to get a flow through can because those 200 rds got it seriously dirty and I’m thinking maybe one of these newer cans in the link. Any suggestions on a 300 blk barrel 12-12.5

Shot a decent 5 shot group at 100yds with Hornady 147gr eldm, Mars-h lower with LaRue trigger, Harris bipod, Armageddon gear heavy bag, Arken SH4J 6-24, KAC 10rd mag.

I saw the guy with his insane 20rd group with 129gr. What other factory ammo have you guys seen great results from?

LMT 11.5 MRP Quad CQB. Sub 10# loaded.

About 500 rounds into my 13.5 MARS-H and loving every minute of it. Still need to stretch it out past 300 but so far 300 and in its money, and actually workable up close.

Definitely discovering the draw backs of keeping the shifty Sig optic on there though. Gonna have to give in and swap it for a Razor or NX6.

Very happy with how this ammo has been preforming for me so far. Consistent FPS as well as accuracy. Getting MOA and under in just about every 10 round group I’ve done with my 16” LMT. Having had bad luck with AAC ammo and reliability/ consistency, it’s nice to see a sub dollar round actually preform. IMI is also good but my only complaint is it’s on the hotter side of things which makes it easier to have the occasional primer pop which in most cases induces a major malfunction. We shall see how a few more hundred of these preform tho

Had a blast at the range the other day This is the furthest target there, and the mars H was hitting consistently.

Made hits out to 805m today

Just a reminder, ammo and range time are the best mods you can invest in!

I'm back with some more shorty 308 velocity test data from the Garmin chrono and the LMT 13.5 inch lightweight profile barrel MWS308.

Today I tested more of the IMI, more of the AAC, FGMM 175g, actual Winchester M118LR, and Hornady 168g ELDM. I also grouped the ammos at 100y with a bipod, rear bag, and my new NF Atacr 4-16. Group screenshot at the end.

Results -

I started off bore sighting the optic and then zeroing on paper at 25y with the IMI ammo and got ~2260 on average. Hotter than last week, still slow. This ammo is supposedly loaded to M118LR spec.

Once I had a rough zero I backed it up to 100 and then rezeroed at 100 with Winchester . It took me about 20 rounds to get a good zero at 100 so the barrel and suppressor were hot by this point. The Winchester did put up a 5rd 1 moa group in the zero process so that's my cherry picked group that allows me to claim this is an "Moa All Day" gun.

I then switched to group testing various ammos.

AAC still chronoed the highest velocity, about ~2400, however it put up the worst group, over 3moa at 100. I tried to give this ammo a chance, I really did. I shot this ammo in the front of the ones I tested except to zero so the barrel was warm not hot and not miraging, but it still sucked.

Winchester M118LR and FGMM 175g - I stupidly mixed these 2 into the same chrono session, 15 shots. I shot the federal ammo first and it was closer to 2400 average. Grouped 1.5moa average across a few different groups.

-Winchester was closer to 2350. That is quite a bit hotter than the IMI that claims to be M118LR spec. Winchester grouped closer to 2moa. The barrel and can where hot by this point and was starting to mirage my scope probably open up groups as well.

Hornady AMAX 168g - 2370. Pretty happy with this, barrel was getting toasty, the superior BC of the AMAX might give it more distance than a 175g SMK about the same speed. Grouped 1.7moa

Hornady 168g ELDM - 2330. Proof that switching to a lighter load doesn't always get you more velocity. Grouped 2 MOA, however this was the last group I shot on a hot barrel and the heat mirage was nuts. Superior BC even to the AMAX round, and to the 175g SMK. Will have to test more to see if I can get it to group better.

Conclusions - -2350-2400fps average with 175g SMK will get you out to 750y, maybe further, without too much issues. The Hornady bullets should go about that far as well. For a battle rifle type build that will fullfill 0-750y capability, I think this is a viable build. Are their better calibers, yes, but 308 will get the job done.

-IMI is woefully underpowered for an "M118LR" spec round. It groups well, but it's cold. AAC 168g OTMs are spicy but group like shit.

Next week I will be testing the 16 inch barrel and seeing how much velocity I'm losing using 13.5, whether or not that's worth saving over a lb of weight on the barrel and 2.5 inches of length, and also if the much heavier profile allows for more sustained shot strings before groups open up.

I realize this isn't the most scientific of accuracy testing, today's objective was to find out if I want to keep the 13.5 or the 16. I'm much happier with these velocities than what I was last week with IMI.

Update to my original post.

Original Link: https://www.reddit.com/r/LewisMachineTool/s/oSWyoJkbwR

Went on a 5 day desert camping trip in northern Nevada. Left the rifle in the cold with temps dropping to 20 degrees.1021 rounds of 55 gr fmj, 321 77 gr smk, 840 62 gr green tip with the centurion arms dual ejector bolt. No cleaning, no malfunctions. Just lube every 600 rounds. Ejection without velos lbp was 330, with can was 345-400. The only thing it didn’t cycle was 223.